1
BITSAT 2021
+3
-1

A force F = a + bx acts on a particle in the x-direction where a and b are constants. The work done by this force during a displacement from x = 0 to x = d is

A
$$\left( {a + {{bd} \over 2}} \right)d$$
B
$$\left( {ad + {{bd} \over 2}} \right)$$
C
$$\left( {{{ad + bd} \over 2}} \right)$$
D
$$(ad + b){d \over 2}$$
2
BITSAT 2021
+3
-1

The bob of a pendulum of length 2 m lies at P, when it reaches Q, it losses 10% of its total energy due to air resistance.

The velocity of bob at Q is

A
6 m/s
B
1 m/s
C
2 m/s
D
8 m/s
3
BITSAT 2020
+3
-1

A ball of mass 0.5 kg is thrown up with initial speed 16 ms$$-$$1 and reaches maximum height of 9 m. How much energy is dissipated by air drag acting on the ball during the ascent?

A
199 J
B
19.9 J
C
20.9 J
D
9.9 J
4
BITSAT 2020
+3
-1

A time dependent force F = (8t) acts on a particle of mass 2 kg. If the particle starts from rest, the work done by the force during the first 1s will be

A
0.4 J
B
4 J
C
19 J
D
4.5 J
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